Business Segments Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 3,745,887	$ 3,046,145	$ 2,500,290
Operating income (loss):	518,296	319,261	187,089
Interest Expense	2,156	9,684	21,375
Other Income	(2,046)	(466)	(311)
Loss on early extinguishment of debt	9,072	0	0
Income before income taxes	509,114	310,043	166,025
Depreciation and amortization:	16,915	17,578	15,950
Northern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	1,595,746	1,256,405	1,027,291
Operating income (loss):	211,958	125,588	96,239
Interest Expense	76	2,465	7,474
Depreciation and amortization:	3,407	3,342	2,944
Southern Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenue	2,048,113	1,702,727	1,417,676
Operating income (loss):	312,661	202,561	115,082
Interest Expense		4,292	10,250
Interest Income, net of Interest Expense	(464)
Depreciation and amortization:	3,644	4,468	4,778
Financial Services Sector [Member]
Segment Reporting Information [Line Items]
Revenue	102,028	87,013	55,323
Operating income (loss):	62,291	53,395	27,350
Interest Expense	3,912	2,927	3,651
Depreciation and amortization:	2,227	3,034	2,095
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Less: Corporate selling, general and administrative expenses	(68,614)	(62,283)	(51,582)
Interest and Other Income	(1,368)	0	0
Depreciation and amortization:	$ 7,637	$ 6,734	$ 6,133